Ahmet Yilanci

Energy and Exergy Analysis of Kizildere Geothermal Power Plant, Turkey

Exergy analysis is important for all energy resource utilization since it is part of energy analysis. In recent years, exergy analysis has been widely used in the design and performance evaluation of thermal systems. In this study, an exergy assessment and modeling of geothermal power plants is presented. A comprehensive case study is conducted in the Kizildere Geothermal Power Plant (KGPP) in Denizli, Turkey. Using the plant data, an evaluation of the KGPP performance, energy and exergy efficiencies, and exergy destructions in each component of the plant as well as in the whole plant are quantified and illustrated using an exergy flow diagram. In addition, a parametric study on the effect of varying reference state properties on the exergy efficiencies of the KGPP is conducted to find the optimum performance and operating conditions.

Exergy analysis and environmental impact assessment of a photovoltaic-hydrogen production system

In this study, exergy analysis and environmental impact assessment of a Photovoltaic (PV)-hydrogen production system and its components are carried out. Actual data measured in the system are employed for analysis purposes. Daily hydrogen production amount from solar energy through water electrolysis is 4.43 kg. The average system exergy efficiency is determined to be 3.18%. It is found that the highest exergy destruction occurs in the PVs. In the PVs, 93.3% of the total exergy input (incoming solar exergy) is destroyed. The second highest exergy destruction is from the electrolyser as 4.76% of the total exergy destruction. The average percent exergy destructions are 1.29% and 1.94% for charge controllers-inverter and batteries, respectively.

Design and performance evaluation of a photovoltaic sun-tracking system driven by a three-freedom spherical motor

In this study, a PV sun tracking system with the ability to move on two axes is designed. Its performance over a fixed tilted system is evaluated for the climatic condition of Denizli, Turkey. From the obtained results, it is seen that the sun tracking system improves the energy and exergy efficiency of the PV panel.

Determination of Some Thermodynamic Parameters for a Hybrid Solar-Hydrogen System

In this paper, we undertake a study to investigate the performance of a hybrid photovoltaic-hydrogen system through energy and exergy efficiencies, improvement potential. This will help identify the irreversibilities (exergy destructions) for performance improvement purposes. Energetic and exergetic renewability ratios are also introduced for grid dependent hybrid energy systems. A case study is presented to highlight the importance of the thermodynamic parameters and show them using some actual and theoretical data. Three different energy demand options from photovoltaic panels to the consumer are identified and considered for the analysis. The minimum and maximum overall energy and exergy efficiencies of the system are calculated based on these options. It is found that the overall energy efficiency values of the system vary between 0.88% and 9.7% while minimum and maximum overall exergy efficiency values of the system are 0.77% and 9.3%, respectively. The monthly improvement potential of the system is also studied to investigate the seasonal performance.Copyright